WO2020207492A1 - Interaction entre une prédiction intra basée sur une matrice et d'autres outils de codage - Google Patents

Interaction entre une prédiction intra basée sur une matrice et d'autres outils de codage Download PDF

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WO2020207492A1
WO2020207492A1 PCT/CN2020/084462 CN2020084462W WO2020207492A1 WO 2020207492 A1 WO2020207492 A1 WO 2020207492A1 CN 2020084462 W CN2020084462 W CN 2020084462W WO 2020207492 A1 WO2020207492 A1 WO 2020207492A1
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video block
current video
block
samples
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PCT/CN2020/084462
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Zhipin DENG
Kai Zhang
Li Zhang
Hongbin Liu
Jizheng Xu
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Beijing Bytedance Network Technology Co., Ltd.
Bytedance Inc.
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Priority to CN202080028043.4A priority Critical patent/CN113678440B/zh
Priority to JP2021559285A priority patent/JP7299341B2/ja
Priority to EP20788667.2A priority patent/EP3935838A4/fr
Priority to KR1020217031712A priority patent/KR20210145755A/ko
Publication of WO2020207492A1 publication Critical patent/WO2020207492A1/fr
Priority to US17/343,041 priority patent/US11457220B2/en

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    • H—ELECTRICITY
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    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
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    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
    • H—ELECTRICITY
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    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/12—Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • H04N19/159—Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
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    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
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    • H04N19/82—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation involving filtering within a prediction loop

Definitions

  • Devices, systems and methods related to digital video coding, and specifically, matrix-based intra prediction methods for video coding are described.
  • the described methods may be applied to both the existing video coding standards (e.g., High Efficiency Video Coding (HEVC) ) and future video coding standards (e.g., Versatile Video Coding (VVC) ) or codecs.
  • HEVC High Efficiency Video Coding
  • VVC Versatile Video Coding
  • a fifth example video processing method includes generating, for a conversion between a current video block of a video and a bitstream representation of the current video block, an intra prediction mode for the current video block coded with a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation; determining a rule for storing information indicative of the intra prediction mode based on whether the current video block is coded with the MIP mode; and performing the conversion according to the rule, where the rule defines that a syntax element for the intra prediction mode is stored in the bitstream representation for the current video block, and where the rule defines that a mode index for the MIP mode for the current video block is not stored in the bitstream representation.
  • MIP matrix based intra prediction
  • a thirteenth example video processing method includes performing a conversion between a current video block of a video and a bitstream representation of the current video block, where the conversion includes generating, by using a matrix based intra prediction (MIP) mode, a prediction block for the current video block by selecting and applying matrix multiplication using matrices of samples and/or by selecting and adding an offset using offset vectors for the current video block, where the samples are obtained from a row and column wise averaging of previously coded samples of the video, and where the selecting is based on reshaping information associated with applying a luma mapping with chroma scaling (LMCS) technique on a reference picture of the current video block.
  • MIP matrix based intra prediction
  • LMCS luma mapping with chroma scaling
  • An eighteenth example video processing method includes performing a conversion between a current video block of a video and a bitstream representation of the current video block according to a rule, where the rule specifies a relationship between applicability of a matrix based intra prediction (MIP) mode or a transform mode during the conversion, where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation, and where the transform mode specifies use of a transform operation for the determining the prediction block for the current video block.
  • MIP matrix based intra prediction
  • the disclosed technology may be used to provide a method for video processing.
  • This exemplary method includes determining that a current video block is coded using an affine linear weighted intra prediction (ALWIP) mode, constructing, based on the determining, at least a portion of a most probable mode (MPM) list for the ALWIP mode based on an at least a portion of an MPM list for a non-ALWIP intra mode, and performing, based on the MPM list for the ALWIP mode, a conversion between the current video block and a bitstream representation of the current video block.
  • AWA affine linear weighted intra prediction
  • MPM most probable mode
  • FIG. 4 shows an example of four reference lines neighboring a prediction block.
  • FIG. 6 shows an example of ALWIP for 4 ⁇ 4 blocks.
  • FIG. 9 shows an example of ALWIP for 16 ⁇ 16 blocks.
  • FIG. 14 shows a flowchart of yet another example method for matrix-based intra prediction, in accordance with the disclosed technology.
  • Video codecs typically include an electronic circuit or software that compresses or decompresses digital video, and are continually being improved to provide higher coding efficiency.
  • a video codec converts uncompressed video to a compressed format or vice versa.
  • the compressed format usually conforms to a standard video compression specification, e.g., the High Efficiency Video Coding (HEVC) standard (also known as H. 265 or MPEG-H Part 2) , the Versatile Video Coding (VVC) standard to be finalized, or other current and/or future video coding standards.
  • HEVC High Efficiency Video Coding
  • VVC Versatile Video Coding
  • Intra prediction involves producing samples for a given TB (transform block) using samples previously reconstructed in the considered color channel.
  • the intra prediction mode is separately signaled for the luma and chroma channels, with the chroma channel intra prediction mode optionally dependent on the luma channel intra prediction mode via the ‘DM_CHROMA’ mode.
  • the intra prediction mode is signaled at the PB (prediction block) level, the intra prediction process is applied at the TB level, in accordance with the residual quad-tree hierarchy for the CU, thereby allowing the coding of one TB to have an effect on the coding of the next TB within the CU, and therefore reducing the distance to the samples used as reference values.
  • HEVC includes 35 intra prediction modes –a DC mode, a planar mode and 33 directional, or ‘angular’ intra prediction modes.
  • the 33 angular intra prediction modes are illustrated in FIG. 1.
  • Multiple reference line (MRL) intra prediction uses more reference lines for intra prediction.
  • FIG. 4 an example of 4 reference lines is depicted, where the samples of segments A and F are not fetched from reconstructed neighboring samples but padded with the closest samples from Segment B and E, respectively.
  • HEVC intra-picture prediction uses the nearest reference line (i.e., reference line 0) .
  • reference line 0 the nearest reference line
  • 2 additional lines reference line 1 and reference line 3
  • the index of selected reference line (mrl_idx) is signalled and used to generate intra predictor.
  • reference line idx which is greater than 0, only include additional reference line modes in MPM list and only signal mpm index without remaining mode.
  • the Intra Sub-Partitions (ISP) tool divides luma intra-predicted blocks vertically or horizontally into 2 or 4 sub-partitions depending on the block size. For example, minimum block size for ISP is 4x8 (or 8x4) . If block size is greater than 4x8 (or 8x4) then the corresponding block is divided by 4 sub-partitions. FIG. 5 shows examples of the two possibilities. All sub-partitions fulfill the condition of having at least 16 samples.
  • predmode ALWIP map_angular_to_alwip idx [predmode Angular ] .
  • predmode Angular map_alwip_to_angular idx (PU) [predmode ALWIP ]
  • portions related to intra_lwip_flag, intra_lwip_mpm_flag, intra_lwip_mpm_idx and intra_lwip_mpm_remainder have been added to the working draft based on embodiments of the disclosed technology.
  • intra_subpartitions_split_flag [x0] [y0] is inferred to be equal to 1.
  • a luma location (xCb, yCb) specifying the top-left sample of the current coding block relative to the top-left luma sample of the current picture
  • the derivation process for quantization parameters as specified in clause 8.7.1 is invoked with the luma location (xCb, yCb) , the width of the current coding block in luma samples cbWidth and the height of the current coding block in luma samples cbHeight, and the variable treeType as inputs.
  • variable cbWidth specifying the width of the current coding block in luma samples
  • variable cbHeight specifying the height of the current coding block in luma samples.
  • the neighboring locations (xNbA, yNbA) and (xNbB, yNbB) are set equal to (xCb -1, yCb) and (xCb, yCb -1) , respectively.
  • X (Ed. (BB) : Neighboring blocks availability checking process tbd] is invoked with the location (xCurr, yCurr) set equal to (xCb, yCb) and the neighboring location (xNbY, yNbY) set equal to (xNbX, yNbX) as inputs, and the output is assigned to availableX.
  • the neighboring locations (xNbA, yNbA) and (xNbB, yNbB) are set equal to (xCb -1, yCb + cbHeight -1) and (xCb + cbWidth -1, yCb -1) , respectively.
  • the candidate intra prediction mode candIntraPredModeX is derived as follows:
  • variable availableX is equal to FALSE.
  • CuPredMode [xNbX] [yNbX] is not equal to MODE_INTRA and ciip_flag [xNbX] [yNbX] is not equal to 1.
  • yCb -1 is less than ( (yCb >> CtbLog2SizeY) ⁇ CtbLog2SizeY) .
  • candIntraPredModeX is derived as follows:
  • IntraSubPartitionsSplitType is equal to ISP_HOR_SPLIT
  • ispDefaultMode1 is set equal to INTRA_ANGULAR18
  • ispDefaultMode2 is set equal to INTRA_ANGULAR5.
  • ispDefaultMode1 is set equal to INTRA_ANGULAR50 and ispDefaultMode2 is set equal to INTRA_ANGULAR63.
  • variable cbWidth specifying the width of the current coding block in luma samples
  • variable cbHeight specifying the height of the current coding block in luma samples.
  • the luma intra prediction mode is derived using IntraPredModeY [xCb + cbWidth /2] [yCb + cbHeight /2] and sizeId as specified in Table 8-X3 and assigning the value of candIntraPredModeX to lumaIntraPredMode.
  • X1 is invoked with the location (xTbCmp, yTbCmp) , the intra prediction mode predModeIntra, the transform block width nTbW and height nTbH as inputs, and the output is predSamples.
  • variable modeId is derived as follows:
  • variable sW is derived using sizeId and modeId as specified in Table 8-X5.
  • X4 is invoked with the input block width predW, the input block height predH, affine linear weighted samples predLwip, the transform block width nTbW, the transform block height nTbH, the upsampling boundary width upsBdryW, the upsampling boundary height upsBdryH, the top upsampling boundary samples upsBdryT, and the left upsampling boundary samples upsBdryL as inputs, and the output is the predicted sample array predSamples.
  • nTbH specifying the transform block height
  • nTbW –1 are set equal to 1 ⁇ (BitDepth Y –1) .
  • nTbW –1 are derived by the following ordered steps:
  • variable upsBdrySize specifying the boundary size for upsampling.
  • upsBdrySize –1 are derived as follows:
  • boundarySize –1 are derived as follows:
  • predSamples [-1] [ (y + 1) * (nTbH /upsBdryH) -1] upsBdryL [y] (8-X38)
  • predSamples [xHor + dX] [yHor] ( (upHor -dX) *predSamples [xHor] [yHor] +dX *predSamples [xHor + upHor] [yHor] ) /upHor (8-X39)
  • predSamples [xVer] [yVer + dY] ( (upVer -dY) *predSamples [xVer] [yVer] +dY *predSamples [xVer] [yVer + upVer] ) /upVer (8-X40)
  • the prediction signal at the remaining positions is generated from the prediction signal on the subsampled set by linear interpolation which is a single step linear interpolation in each direction.
  • predmode Angular map_alwip_to_angular idx (PU) [predmode ALWIP ]
  • a Multiple Transform Selection (MTS) scheme is used for residual coding both inter and intra coded blocks. It uses multiple selected transforms from the DCT8/DST7.
  • the newly introduced transform matrices are DST-VII and DCT-VIII.
  • Reduced secondary transform applies 16x16 and 16x64 non-separable transform for 4x4 and 8x8 blocks, respectively.
  • Primary forward and inverse transforms are still performed the same way as two 1-D horizontal/vertical transform passes.
  • Secondary forward and inverse transforms are a separate process step from that of primary transforms.
  • primary forward transform is performed first, then followed by secondary forward transform and quantization, and CABAC bit encoding.
  • CABAC bit decoding and inverse quantization then Secondary inverse transform is performed first, then followed by primary inverse transform.
  • RST applies only to intra coded TUs in both intra slice and inter slices.
  • the MPM list is constructed based on intra modes of the left and above neighboring block as in VTM4.0. Suppose the mode of the left is denoted as Left and the mode of the above block is denoted as Above, the unified MPM list is constructed as follows:
  • MPM list ⁇ ⁇ Planar, Left, Above, DC, Max -1, Max +1 ⁇
  • MPM list ⁇ ⁇ Planar, Left, Above, DC, Max -2, Max +2 ⁇
  • MPM list ⁇ ⁇ Planar, Left, Left -1, Left +1, DC, Left -2 ⁇
  • the first bin of the MPM index codeword is CABAC context coded. In total three contexts are used, corresponding to whether the current intra block is MRL enabled, ISP enabled, or a normal intra block.
  • the left neighboring block and above neighboring block used in the unified MPM list construction is A2 and B2 as shown in FIG. 10.
  • One MPM flag is firstly coded. If the block is coded with one of mode in the MPM list, an MPM index is further coded. Otherwise, an index to the remaining modes (excluding MPMs) is coded.
  • ALWIP is only applied to luma component of the block.
  • a chroma mode index is coded and sent to decoder, which could result in unnecessary signaling.
  • ALWIP coded blocks are treated as normal intra-blocks.
  • an intra-prediction mode refers to an angular intra prediction mode (including DC, planar, CCLM and other possible intra prediction modes) ; while an intra mode refers to normal intra mode, or MRL, or ISP or ALWIP.
  • Shift (x, n) (x+ offset0) >>n.
  • offset0 and/or offset1 are set to (1 ⁇ n) >>1 or (1 ⁇ (n-1) ) . In another example, offset0 and/or offset1 are set to 0.
  • Clip3 (min, max, x) is defined as
  • the whole or partial of the MPM list for ALWIP may be constructed according to the whole or partial procedure to construct the MPM list for non-ALWIP intra mode (such as normal intra mode, MRL, or ISP) .
  • non-ALWIP intra mode such as normal intra mode, MRL, or ISP
  • the size of MPM list is 6 for both ALWIP and non-ALWIP intra modes.
  • the MPM list for ALWIP may be derived from the MPM list for non-ALWIP intra mode.
  • pruning may be applied.
  • default modes may be added after those converted from the MPM list of non-ALWIP intra mode.
  • default modes may be added in an interleaved way with those converted from the MPM list of non-ALWIP intra mode.
  • the default modes may be fixed to be the same for all kinds of blocks.
  • the default modes may be determined according to coded information, such as availability of neighboring blocks, mode information of neighboring blocks, block dimension.
  • one intra-prediction mode in the MPM list for non-ALWIP intra mode may be converted to its corresponding ALWIP intra-prediction mode, when it is put into the MPM list for ALWIP.
  • all the intra-prediction modes in the MPM list for non-ALWIP intra modes may be converted to corresponding ALWIP intra-prediction modes before being used to construct the MPM list for ALWIP.
  • all the candidate intra-prediction modes may include the intra-prediction modes from neighboring blocks and default intra-prediction modes such as Planar and DC) may be converted to corresponding ALWIP intra-prediction modes before being used to construct the MPM list for non-ALWIP intra modes, if the MPM list for non-ALWIP intra modes may be further used to derive the MPM list for ALWIP.
  • two converted ALWIP intra-prediction modes may be compared.
  • K out of S intra-prediction modes in the MPM list for non-ALWIP intra modes may be picked as the MPM list for ALWIP mode.
  • K is equal to 3 and S is equal to 6.
  • the first K intra-prediction modes in the MPM list for non-ALWIP intra modes may be picked as the MPM list for ALWIP mode.
  • the one or multiple neighboring blocks used to derive the MPM list for ALWIP may also be used to used derive the MPM list for non-ALWIP intra modes (such as normal intra mode, MRL, or ISP) .
  • the neighboring block left to the current block used to derive the MPM list for ALWIP should be the same as that used to derive the MPM list for non-ALWIP intra modes.
  • the left neighboring block used to derive the MPM list for both ALWIP and non-ALWIP intra modes may cover the position (xCb-1, yCb) .
  • the left neighboring block used to derive the MPM list for both ALWIP and non-ALWIP intra modes may cover the position (xCb-1, yCb+H-1) .
  • the left neighboring block and above neighboring block used in the unified MPM list construction is A2 and B2 as shown in FIG. 10.
  • the neighboring block above to the current block used to derive the MPM list for ALWIP should be the same as that used to derive the MPM list for non-ALWIP intra modes.
  • the above neighboring block used to derive the MPM list for both ALWIP and non-ALWIP intra modes may cover the position (xCb, yCb-1) .
  • the above neighboring block used to derive the MPM list for both ALWIP and non-ALWIP intra modes may cover the position (xCb+W-1, yCb-1) .
  • the left neighboring block and above neighboring block used in the unified MPM list construction is A1 and B1 as shown in FIG. 10.
  • the MPM list for ALWIP may be constructed in different ways according to the width and/or height of the current block.
  • different neighboring blocks may be accessed for different block dimensions.
  • K out of S intra-prediction modes in the MPM list construction procedure of non-ALWIP intra modes may be derived for the MPM list used in ALWIP mode.
  • K is equal to 3 and S is equal to 6.
  • the first K intra-prediction modes in the MPM list construction procedure may be derived for the MPM list used in ALWIP mode.
  • the first mode in the MPM list may be different.
  • X0 may be the ALWIP intra-prediction mode converted from Planar.
  • stuffing modes in the MPM list may be different.
  • the first three stuffing modes in the MPM list for non-ALWIP intra modes may be DC, Vertical and Horizontal, but they may be Mode X1, X2, X3 in the MPM list for ALWIP.
  • X1, X2, X3 may be different for different sizeId.
  • the number of stuffing mode may be different.
  • neighboring modes in the MPM list may be different.
  • the normal intra-prediction modes of neighboring blocks are used to construct the MPM list for non-ALWIP intra modes. And they are converted to ALWIP intra-prediction modes to construct the MPM list for ALWIP mode.
  • the shifted modes in the MPM list may be different.
  • X+K0 where X is a normal intra-prediction mode and K0 is an integer may be put into the MPM list for non-ALWIP intra modes.
  • Y+K1 where Y is an ALWIP intra-prediction mode and K1 is an integer may be put into the MPM list for ALWIP, where K0 may be different from K1.
  • K1 may depend on the width and height.
  • a neighboring block is treated as being coded with a predefined intra-prediction mode (such as Planar) if it is coded with ALWIP when constructing the MPM list for the current block with non-ALWIP intra modes.
  • a predefined intra-prediction mode such as Planar
  • a neighboring block is treated as being coded with a predefined ALWIP intra-prediction mode X if it is coded with non-ALWIP intra modes when constructing the MPM list for the current block with ALWIP mode.
  • X may depend on the block dimensions, such as width and/or height.
  • the conditional check of whether the 2 nd block is coded with ALWIP is skipped.
  • the 2 nd block to be accessed is located in a different LCU/CTU row/region compared to the current block, the 2 nd block is treated in the same way as non-ALWIP mode, such as treated as normal intra coded block.
  • K 1.
  • the decoded mode index associated with one ALWIP coded block is mapped to the normal intra mode, such as according to map_alwip_to_angular as described in Section 2.5.7.
  • condition check of whether one neighboring/current block is coded with ALWIP flag may be skipped.
  • the conversion of modes assigned for ALWIP coded blocks and normal intra predictions associated with one accessed block may be skipped.
  • an inferred chroma intra mode (e.g., DM mode) might be always applied if the corresponding luma block is coded with ALWIP mode.
  • chroma intra mode is inferred to be DM mode without signaling if the corresponding luma block is coded with ALWIP mode.
  • the corresponding luma block may be the one covering the corresponding sample of a chroma sample located at a given position (e.g., top-left of current chroma block, center of current chroma block) .
  • the DM mode may be derived according to the intra prediction mode of the corresponding luma block, such as via mapping the (ALWIP) mode to one of the normal intra mode.
  • ALWIP may also be applied to chroma components.
  • the matrix and/or bias vector may be predefined jointly for Cb and Cr.
  • Cb and Cr component may be concatenated.
  • Cb and Cr component may be interleaved.
  • the chroma component may share the same ALWIP intra-prediction mode as the corresponding luma block.
  • the same ALWIP intra-prediction mode is applied on the chroma component if the corresponding luma block applies the ALWIP mode and the chroma block is coded with DM mode.
  • the number of ALWIP intra-prediction modes for chroma components may be less than that for luma component for the same block width and height.
  • a may be signaled at sequence level (e.g. in SPS) , at picture level (e.g. in PPS or picture header) , at slice level (e.g. in slice header) , at tile group level (e.g. in tile group header) , at tile level, at CTU row level, or at CTU level.
  • sequence level e.g. in SPS
  • picture level e.g. in PPS or picture header
  • slice level e.g. in slice header
  • tile group level e.g. in tile group header
  • intra_lwip_flag may not be signaled and inferred to be 0 if ALWIP cannot be applied.
  • ALWIP may depend on the block width (W) and/or height (H) .
  • T 256;
  • T 256;
  • T 256;
  • intra_lwip_flag may not be signaled and inferred to be 0 if ALWIP cannot be applied.
  • the right shift operation may be different when S is equal to 0 or larger than 0.
  • upsBdryX [x] should be calculated as and when uDwn is equal to 1.
  • upsBdryX [x] should be calculated as
  • results should be rounded toward-zero or away-from-zero in the up-sampling process of ALWIP.
  • predSamples [xVer] [yVer + dY] ( (upVer -dY) *predSamples [xVer] [yVer] +dY *predSamples [xVer] [yVer + upVer] +offsetVer) /upVer (8-X40)
  • a CIIP-coded block it may be explicitly signaled whether an ALWIP intra-prediction mode or a normal intra prediction mode such as Planar is used to generate the intra prediction signal.
  • an ALWIP intra-prediction mode or a normal intra prediction mode such as Planar may be used to generate the intra prediction signal.
  • ALWIP intra-prediction mode may never be used in a CIIP coded block.
  • ii it may be inferred from information of neighboring blocks whether an ALWIP intra-prediction mode or a normal intra prediction mode such as Planar is used to generate the intra prediction signal.
  • the whole or partial of the procedure used to down-sample the neighboring luma samples in the ALWIP mode may be used to down-sample the neighboring samples in the CCLM mode.
  • the down-sampling procedure may be invoked with different parameters/arguments when it is used in the CCLM process and ALWIP process.
  • the down-sampling method (such as selection of neighboring luma locations, down-sampling filters) in the CCLM process may be utilized in the ALWIP process.
  • the procedure used to down-sample the neighboring luma samples at least include the selection of down-sampled positions, the down-sampling filters, the rounding and clipping operations.
  • ALWIP mode may be disallowed when RST or/and secondary transform or/and rotation transform or/and NSST is applied.
  • a block coded with ALWIP mode may apply RST or/and secondary transform or/and rotation transform or/and Non-Separable Secondary Transform (NSST) .
  • the selection of transform matrix may depend the ALWIP intra-prediction mode.
  • the selection of transform matrix may depend the normal intra-prediction mode which is converted from the ALWIP intra-prediction mode.
  • ALWIP mode may be disallowed when BDPCM or RDPCM is applied.
  • a block coded with ALWIP mode may only use DCT-II as the transform.
  • the signalling of transform matrix indices is always skipped.
  • a block coded with ALWIP mode may only use transform skip.
  • ALWIP mode information (such as enabled/disabled, prediction mode index) may be conditionally signalled after indications of transform matrix.
  • the indications of ALWIP mode information may be signalled.
  • the indications of ALWIP mode information may be skipped for some pre-defined transform matrices.
  • a block coded with ALWIP mode is regarded to be coded with a normal intra-prediction converted from the ALWIP intra-prediction mode when the selected transform is mode-dependent.
  • ALWIP mode may not use transform skip.
  • ALWIP mode may be disallowed when transform skip is applied.
  • Unfiltered neighboring samples may be used in ALWIP mode.
  • filtered neighboring samples may be used in ALWIP mode.
  • filtered neighboring samples may be used for down sampling and unfiltered neighboring samples may be used for up sampling.
  • unfiltered neighboring samples may be used for down sampling and filtered neighboring samples may be used for up sampling.
  • filtered left neighboring samples may be used in up sampling and unfiltered above neighboring samples may be used in up sampling.
  • unfiltered left neighboring samples may be used in up sampling and filtered above neighboring samples may be used in up sampling.
  • whether filter or unfiltered neighboring samples is used may depend on the ALWIP mode.
  • ALWIP mode may be converted to traditional intra prediction mode, and whether filtered or unfiltered neighboring samples is used may depend on the converted traditional intra prediction mode. For example, such decision is same as traditional intra prediction modes.
  • Which matrices or/and offset vectors are used may depend on reshaping (a. k. a. LMCS, luma mapping with chroma scaling) information.
  • matrices or/and offset vectors may be used when reshaping is on and off.
  • different matrices or/and offset vectors may be used for different reshaping parameters.
  • ALWIP may be always performed in original domain.
  • ALWIP may be disabled when reshaping is applied.
  • reshaping may be disabled when ALWIP is enabled.
  • the matrices used in ALWIP may depend on sample bit-depth.
  • the prediction generated by ALWIP may be treated as an intermediate signal which will be processed to obtain the prediction signal to be further used.
  • Position Dependent Intra Prediction Combination may be applied on the prediction generated by ALWIP to generate the prediction signal to be further used.
  • the boundary samples prediction generated by ALWIP may be filtered with neighbouring samples to generate the prediction signal to be further used.
  • interpolation filters other than bilinear interpolation filter may be used in the up-sampling process of ALWIP.
  • 4-tap interpolation filters may be used in the up-sampling process of ALWIP.
  • the 4-tap interpolation filters in VVC used to do the motion compensation for chroma components may be used in the up-sampling process of ALWIP.
  • the 4-tap interpolation filters in VVC used to do angular intra-prediction may be used in the up-sampling process of ALWIP.
  • the 8-tap interpolation filters in VVC used to do the motion compensation for luma component may be used in the up-sampling process of ALWIP.
  • FIG. 11 shows a flowchart of an exemplary method for video processing.
  • the method 1100 includes, at step 1102, determining that a current video block is coded using an affine linear weighted intra prediction (ALWIP) mode.
  • AWIP affine linear weighted intra prediction
  • the method 1100 includes, at step 1104, constructing, based on the determining, at least a portion of a most probable mode (MPM) list for the ALWIP mode based on an at least a portion of an MPM list for a non-ALWIP intra mode.
  • MPM most probable mode
  • the method 1100 includes, at step 1106, performing, based on the MPM list for the ALWIP mode, a conversion between the current video block and a bitstream representation of the current video block.
  • a size of the MPM list of the ALWIP mode is identical to a size of the MPM list for the non-ALWIP intra mode. In an example, the size of the MPM list of the ALWIP mode is 6.
  • the method 1100 further comprises the step of inserting default modes to the MPM list for the ALWIP mode.
  • the default modes are inserted prior to the portion of a MPM list for the ALWIP mode that is based on the MPM list for the non-ALWIP intra mode.
  • the default modes are inserted subsequent to the portion of a MPM list for the ALWIP mode that is based on the MPM list for the non-ALWIP intra mode.
  • the default modes are inserted in an interleaved manner with the portion of a MPM list for the ALWIP mode that is based on the MPM list for the non-ALWIP intra mode.
  • constructing the MPM list for the ALWIP mode and the MPM list for the non-ALWIP intra mode is based on one or more neighboring blocks.
  • constructing the MPM list for the ALWIP mode and the MPM list for the non-ALWIP intra mode is based a height or a width of the current video block.
  • constructing the MPM list for the ALWIP mode is based on a first set of parameters that is different from a second set of parameters used to construct the MPM list for the non-ALWIP intra mode.
  • the method 1100 further includes the step of determining that a neighboring block of the current video block has been coded with the ALWIP mode, and designating, in constructing the MPM list for the non-ALWIP intra mode, the neighboring block as unavailable.
  • the method 1100 further includes the step of determining that a neighboring block of the current video block has been coded with the non-ALWIP intra mode, and designating, in constructing the MPM list for the ALWIP mode, the neighboring block as unavailable.
  • the non-ALWIP intra mode is based on a normal intra mode, a multiple reference line (MRL) intra prediction mode or an intra sub-partition (ISP) tool.
  • MNL multiple reference line
  • ISP intra sub-partition
  • FIG. 12 shows a flowchart of an exemplary method for video processing.
  • the method 1200 includes, at step 1210, determining that a luma component of a current video block is coded using an affine linear weighted intra prediction (ALWIP) mode.
  • AWIP affine linear weighted intra prediction
  • the method 1200 includes, at step 1220, inferring, based on the determining, a chroma intra mode.
  • the method 1200 includes, at step 1230, performing, based on the chroma intra mode, a conversion between the current video block and a bitstream representation of the current video block.
  • the luma component covers a predetermined chroma sample of the chroma component.
  • the predetermined chroma sample is a top-left sample or a center sample of the chroma component.
  • the inferred chroma intra mode is a DM mode.
  • the inferred chroma intra mode is the ALWIP mode.
  • the ALWIP mode is applied to one or more chroma components of the current video block.
  • different matrix or bias vectors of the ALWIP mode are applied to different color components of the current video block.
  • the different matrix or bias vectors are predefined jointly for Cb and Cr components.
  • the Cb and Cr components are concatenated.
  • the Cb and Cr components are interleaved.
  • FIG. 13 shows a flowchart of an exemplary method for video processing.
  • the method 1300 includes, at step 1302, determining that a current video block is coded using an affine linear weighted intra prediction (ALWIP) mode.
  • AWIP affine linear weighted intra prediction
  • the method 1300 includes, at step 1304, performing, based on the determining, a conversion between the current video block and a bitstream representation of the current video block.
  • the determining is based on signaling in a sequence parameter set (SPS) , a picture parameter set (PPS) , a slice header, a tile group header, a tile header, a coding tree unit (CTU) row or a CTU region.
  • SPS sequence parameter set
  • PPS picture parameter set
  • CTU coding tree unit
  • the determining is based on a height (H) or a width (W) of the current video block.
  • the determining is based on a height (H) or a width (W) of the current video block.
  • H height
  • W width
  • W + H ⁇ T W + H ⁇ T.
  • W ⁇ H ⁇ T W ⁇ H ⁇ T.
  • T 256.
  • FIG. 14 shows a flowchart of an exemplary method for video processing.
  • the method 1400 includes, at step 1402, determining that a current video block is coded using a coding mode different from an affine linear weighted intra prediction (ALWIP) mode.
  • AWIP affine linear weighted intra prediction
  • the method 1400 includes, at step 1404, performing, based on the determining, a conversion between the current video block and a bitstream representation of the current video block.
  • the coding mode is a combined intra and inter prediction (CIIP) mode
  • method 1400 further includes the step of performing a selection between the ALWIP mode and a normal intra prediction mode.
  • performing the selection is based on an explicit signaling in the bitstream representation of the current video block.
  • performing the selection is based on predetermined rule.
  • the predetermined rule always selects the ALWIP mode when the current video block is coded using the CIIP mode.
  • the predetermined rule always selects the normal intra prediction mode when the current video block is coded using the CIIP mode.
  • the coding mode is a cross-component linear model (CCLM) prediction mode.
  • a downsampling procedure for the ALWIP mode is based on a downsampling procedure for the CCLM prediction mode.
  • the downsampling procedure for the ALWIP mode is based on a first set of parameters, and where the downsampling procedure for the CCLM prediction mode is based on a second set of parameters different from the first set of parameters.
  • the downsampling procedure for the ALWIP mode or the CCLM prediction mode comprises at least one of a selection of downsampled positions, a selection of downsampling filters, a rounding operation or a clipping operation.
  • the method 1400 further includes the step of applying one or more of a Reduced Secondary Transform (RST) , a secondary transform, a rotation transform or a Non-Separable Secondary Transform (NSST) .
  • RST Reduced Secondary Transform
  • NSST Non-Separable Secondary Transform
  • the method 1400 further includes the step of applying block-based differential pulse coded modulation (DPCM) or residual DPCM.
  • DPCM block-based differential pulse coded modulation
  • residual DPCM residual DPCM
  • FIG. 15 is a block diagram of a video processing apparatus 1500.
  • the apparatus 1500 may be used to implement one or more of the methods described herein.
  • the apparatus 1500 may be embodied in a smartphone, tablet, computer, Internet of Things (IoT) receiver, and so on.
  • the apparatus 1500 may include one or more processors 1502, one or more memories 1504 and video processing hardware 1506.
  • the processor (s) 1502 may be configured to implement one or more methods (including, but not limited to, methods 1100 to 1400, and 2000 to 3800) described in the present document.
  • the memory (memories) 1504 may be used for storing data and code used for implementing the methods and techniques described herein.
  • the video processing hardware 1506 may be used to implement, in hardware circuitry, some techniques described in the present document.
  • the video coding methods may be implemented using an apparatus that is implemented on a hardware platform as described with respect to FIG. 15.
  • FIG. 16 is a block diagram showing an example video processing system 1600 in which various techniques disclosed herein may be implemented.
  • the system 1600 may include input 1602 for receiving video content.
  • the video content may be received in a raw or uncompressed format, e.g., 8 or 10 bit multi-component pixel values, or may be in a compressed or encoded format.
  • the input 1602 may represent a network interface, a peripheral bus interface, or a storage interface. Examples of network interface include wired interfaces such as Ethernet, passive optical network (PON) , etc. and wireless interfaces such as Wi-Fi or cellular interfaces.
  • PON passive optical network
  • peripheral bus interface or a display interface may include universal serial bus (USB) or high definition multimedia interface (HDMI) or Displayport, and so on.
  • storage interfaces include SATA (serial advanced technology attachment) , PCI, IDE interface, and the like.
  • Some embodiments of the disclosed technology include making a decision or determination to enable a video processing tool or mode.
  • the encoder when the video processing tool or mode is enabled, the encoder will use or implement the tool or mode in the processing of a block of video, but may not necessarily modify the resulting bitstream based on the usage of the tool or mode. That is, a conversion from the block of video to the bitstream representation of the video will use the video processing tool or mode when it is enabled based on the decision or determination.
  • the decoder when the video processing tool or mode is enabled, the decoder will process the bitstream with the knowledge that the bitstream has been modified based on the video processing tool or mode. That is, a conversion from the bitstream representation of the video to the block of video will be performed using the video processing tool or mode that was enabled based on the decision or determination.
  • Some embodiments of the disclosed technology include making a decision or determination to disable a video processing tool or mode.
  • the encoder will not use the tool or mode in the conversion of the block of video to the bitstream representation of the video.
  • the decoder will process the bitstream with the knowledge that the bitstream has not been modified using the video processing tool or mode that was disabled based on the decision or determination.
  • FIG. 17 is a block diagram that illustrates an example video coding system 100 that may utilize the techniques of this disclosure.
  • video coding system 100 may include a source device 110 and a destination device 120.
  • Source device 110 generates encoded video data which may be referred to as a video encoding device.
  • Destination device 120 may decode the encoded video data generated by source device 110 which may be referred to as a video decoding device.
  • Source device 110 may include a video source 112, a video encoder 114, and an input/output (I/O) interface 116.
  • I/O input/output
  • Video source 112 may include a source such as a video capture device, an interface to receive video data from a video content provider, and/or a computer graphics system for generating video data, or a combination of such sources.
  • the video data may comprise one or more pictures.
  • Video encoder 114 encodes the video data from video source 112 to generate a bitstream.
  • the bitstream may include a sequence of bits that form a coded representation of the video data.
  • the bitstream may include coded pictures and associated data.
  • the coded picture is a coded representation of a picture.
  • the associated data may include sequence parameter sets, picture parameter sets, and other syntax structures.
  • I/O interface 116 may include a modulator/demodulator (modem) and/or a transmitter.
  • the encoded video data may be transmitted directly to destination device 120 via I/O interface 116 through network 130a.
  • the encoded video data may also be stored onto a storage medium/server 130b for access by destination device 120.
  • Destination device 120 may include an I/O interface 126, a video decoder 124, and a display device 122.
  • I/O interface 126 may include a receiver and/or a modem. I/O interface 126 may acquire encoded video data from the source device 110 or the storage medium/server 130b. Video decoder 124 may decode the encoded video data. Display device 122 may display the decoded video data to a user. Display device 122 may be integrated with the destination device 120, or may be external to destination device 120 which be configured to interface with an external display device.
  • FIG. 18 is a block diagram illustrating an example of video encoder 200, which may be video encoder 114 in the system 100 illustrated in FIG. 17.
  • Video encoder 200 may be configured to perform any or all of the techniques of this disclosure.
  • video encoder 200 includes a plurality of functional components. The techniques described in this disclosure may be shared among the various components of video encoder 200.
  • a processor may be configured to perform any or all of the techniques described in this disclosure.
  • the functional components of video encoder 200 may include a partition unit 201, a predication unit 202 which may include a mode select unit 203, a motion estimation unit 204, a motion compensation unit 205 and an intra prediction unit 206, a residual generation unit 207, a transform unit 208, a quantization unit 209, an inverse quantization unit 210, an inverse transform unit 211, a reconstruction unit 212, a buffer 213, and an entropy encoding unit 214.
  • a partition unit 201 may include a mode select unit 203, a motion estimation unit 204, a motion compensation unit 205 and an intra prediction unit 206, a residual generation unit 207, a transform unit 208, a quantization unit 209, an inverse quantization unit 210, an inverse transform unit 211, a reconstruction unit 212, a buffer 213, and an entropy encoding unit 214.
  • video encoder 200 may include more, fewer, or different functional components.
  • predication unit 202 may include an intra block copy (IBC) unit.
  • the IBC unit may perform predication in an IBC mode in which at least one reference picture is a picture where the current video block is located.
  • IBC intra block copy
  • motion estimation unit 204 and motion compensation unit 205 may be highly integrated, but are represented in the example of FIG. 18 separately for purposes of explanation.
  • Partition unit 201 may partition a picture into one or more video blocks.
  • Video encoder 200 and video decoder 300 may support various video block sizes.
  • Mode select unit 203 may select one of the coding modes, intra or inter, e.g., based on error results, and provide the resulting intra-or inter-coded block to a residual generation unit 207 to generate residual block data and to a reconstruction unit 212 to reconstruct the encoded block for use as a reference picture.
  • Mode select unit 203 may select a combination of intra and inter predication (CIIP) mode in which the predication is based on an inter predication signal and an intra predication signal.
  • CIIP intra and inter predication
  • Mode select unit 203 may also select a resolution for a motion vector (e.g., a sub-pixel or integer pixel precision) for the block in the case of inter-predication.
  • motion estimation unit 204 may generate motion information for the current video block by comparing one or more reference frames from buffer 213 to the current video block.
  • Motion compensation unit 205 may determine a predicted video block for the current video block based on the motion information and decoded samples of pictures from buffer 213 other than the picture associated with the current video block.
  • Motion estimation unit 204 and motion compensation unit 205 may perform different operations for a current video block, for example, depending on whether the current video block is in an I slice, a P slice, or a B slice.
  • motion estimation unit 204 may output a full set of motion information for decoding processing of a decoder.
  • motion estimation unit 204 may do not output a full set of motion information for the current video. Rather, motion estimation unit 204 may signal the motion information of the current video block with reference to the motion information of another video block. For example, motion estimation unit 204 may determine that the motion information of the current video block is sufficiently similar to the motion information of a neighboring video block.
  • motion estimation unit 204 may indicate, in a syntax structure associated with the current video block, a value that indicates to the video decoder 300 that the current video block has the same motion information as the another video block.
  • Intra prediction unit 206 may perform intra prediction on the current video block. When intra prediction unit 206 performs intra prediction on the current video block, intra prediction unit 206 may generate prediction data for the current video block based on decoded samples of other video blocks in the same picture.
  • the prediction data for the current video block may include a predicted video block and various syntax elements.
  • Residual generation unit 207 may generate residual data for the current video block by subtracting (e.g., indicated by the minus sign) the predicted video block (s) of the current video block from the current video block.
  • the residual data of the current video block may include residual video blocks that correspond to different sample components of the samples in the current video block.
  • residual generation unit 207 may not perform the subtracting operation.
  • Transform processing unit 208 may generate one or more transform coefficient video blocks for the current video block by applying one or more transforms to a residual video block associated with the current video block.
  • quantization unit 209 may quantize the transform coefficient video block associated with the current video block based on one or more quantization parameter (QP) values associated with the current video block.
  • QP quantization parameter
  • Inverse quantization unit 210 and inverse transform unit 211 may apply inverse quantization and inverse transforms to the transform coefficient video block, respectively, to reconstruct a residual video block from the transform coefficient video block.
  • Reconstruction unit 212 may add the reconstructed residual video block to corresponding samples from one or more predicted video blocks generated by the predication unit 202 to produce a reconstructed video block associated with the current block for storage in the buffer 213.
  • loop filtering operation may be performed reduce video blocking artifacts in the video block.
  • Entropy encoding unit 214 may receive data from other functional components of the video encoder 200. When entropy encoding unit 214 receives the data, entropy encoding unit 214 may perform one or more entropy encoding operations to generate entropy encoded data and output a bitstream that includes the entropy encoded data.
  • the video decoder 300 may be configured to perform any or all of the techniques of this disclosure.
  • the video decoder 300 includes a plurality of functional components.
  • the techniques described in this disclosure may be shared among the various components of the video decoder 300.
  • a processor may be configured to perform any or all of the techniques described in this disclosure.
  • video decoder 300 includes an entropy decoding unit 301, a motion compensation unit 302, an intra prediction unit 303, an inverse quantization unit 304, an inverse transformation unit 305 , and a reconstruction unit 306 and a buffer 307.
  • Video decoder 300 may, in some examples, perform a decoding pass generally reciprocal to the encoding pass described with respect to video encoder 200 (FIG. 18) .
  • Entropy decoding unit 301 may retrieve an encoded bitstream.
  • the encoded bitstream may include entropy coded video data (e.g., encoded blocks of video data) .
  • Entropy decoding unit 301 may decode the entropy coded video data, and from the entropy decoded video data, motion compensation unit 302 may determine motion information including motion vectors, motion vector precision, reference picture list indexes, and other motion information. Motion compensation unit 302 may, for example, determine such information by performing the AMVP and merge mode.
  • Motion compensation unit 302 may produce motion compensated blocks, possibly performing interpolation based on interpolation filters. Identifiers for interpolation filters to be used with sub-pixel precision may be included in the syntax elements.
  • Motion compensation unit 302 may use interpolation filters as used by video encoder 20 during encoding of the video block to calculate interpolated values for sub-integer pixels of a reference block. Motion compensation unit 302 may determine the interpolation filters used by video encoder 200 according to received syntax information and use the interpolation filters to produce predictive blocks.
  • Reconstruction unit 306 may sum the residual blocks with the corresponding prediction blocks generated by motion compensation unit 202 or intra-prediction unit 303 to form decoded blocks. If desired, a deblocking filter may also be applied to filter the decoded blocks in order to remove blockiness artifacts.
  • the decoded video blocks are then stored in buffer 307, which provides reference blocks for subsequent motion compensation/intra predication and also produces decoded video for presentation on a display device.
  • the ALWIP mode or the MIP mode is used to compute a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation (or an averaging operation) , followed by a matrix vector multiplication operation, and selectively (or optionally) followed by an upsampling operation (or a linear interpolation operation) .
  • the ALWIP mode or the MIP mode is used to compute a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation (or an averaging operation) and followed by a matrix vector multiplication operation.
  • the ALWIP mode or the MIP mode can also perform an upsampling operation (or a linear interpolation operation) after performing the matrix vector multiplication operation.
  • Operation 2004 includes performing the conversion between the current video block and the coded representation of the current video block using the first MPM list, where the conversion of the current video block uses a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation, where the rule specifies that the first procedure used for generation of the first MPM list is same as a second procedure used for generation of a second MPM list for conversion of other video blocks of the video that are coded using a non-MIP intra mode that is different from the MIP mode, and where at least a portion of the first MPM list is generated based on at least a portion of the second MPM list.
  • MIP matrix based intra prediction
  • a size of the first MPM list for the MIP mode is same as that of the second MPM list for the non-MIP intra mode. In some embodiments for method 2000, the size of the first MPM list for the MIP mode and of the second MPM list for the non-MIP intra mode is 6. In some embodiments for method 2000, the second MPM list for the non-MIP intra mode is constructed before the first MPM list for the MIP mode is constructed. In some embodiments for method 2000, the portion or all of the second MPM list for the non-MIP intra mode is converted to MPMs that are added to the portion of the first MPM list for the MIP mode.
  • a subset of the MPMs are added to the portion of the first MPM list for the MIP mode by pruning the MPMs.
  • the method 2000 further includes adding default intra-prediction modes to the first MPM list for the MIP mode.
  • the default intra-prediction modes are added to the first MPM list for the MIP mode prior to the portion of the first MPM list for the MIP mode that is based on the portion of the second MPM list for the non-MIP intra mode.
  • the default intra-prediction modes are added to the first MPM list for the MIP mode after the portion of the first MPM list for the MIP mode that is based on the portion of the second MPM list for the non-MIP intra mode. In some embodiments for method 2000, the default intra-prediction modes are added to the first MPM list for the MIP mode in an interleaved manner with the portion of the first MPM list for the MIP mode that is based on the portion of the second MPM list for the non-MIP intra mode. In some embodiments for method 2000, the default intra-prediction modes are same for a plurality of types of video blocks.
  • the default intra-prediction modes are determined based on coded information of the current video block.
  • the coded information includes availability of neighboring video blocks, mode information of the neighboring video blocks, or block dimension of the current video block.
  • one intra-prediction mode in the second MPM list for the non-MIP intra mode is converted to its corresponding MIP mode to obtain a converted MIP mode that is added to the first MPM list for the MIP mode.
  • all intra-prediction modes in the second MPM list for the non-MIP intra mode are converted to its corresponding MIP mode to obtain a plurality of converted MIP modes that are added to the first MPM list for the MIP mode.
  • all intra-prediction modes are converted to its corresponding MIP mode to obtain a plurality of converted MIP modes that are used to construct the second MPM list for the non- MIP intra mode.
  • two intra-prediction modes in the second MPM list for the non-MIP intra mode are converted to its corresponding MIP modes to obtain two converted MIP modes, and one of two converted MIP modes is added to the first MPM list for the MIP mode in response to the two converted MIP modes being same.
  • two intra-prediction modes in the second MPM list for the non-MIP intra mode are converted to its corresponding MIP modes to obtain two converted MIP modes, and one of two converted MIP modes is added to the second MPM list for the non-MIP intra mode in response to the two converted MIP modes being same.
  • the second MPM list for non-MIP intra mode includes S intra-prediction modes, and where K out of S intra-prediction modes is or are selected to be included in the first MPM list for MIP mode. In some embodiments for method 2000, K is 3 and S is 6. In some embodiments for method 2000, the first K intra-prediction modes in the second MPM list for non-MIP intra mode is selected to be included in the first MPM list for MIP mode. In some embodiments for method 2000, the first MPM list for the MIP mode and the second MPM list for the non-MIP intra mode is derived or constructed based on one or more neighboring video blocks of the current video block. In some embodiments for method 2000, the first MPM list for the MIP mode and the second MPM list for the non-MIP intra mode is derived or constructed based on a same neighboring video block located to a left of the current video block.
  • the same neighboring video block located to the left is directly to left of the current video block and is aligned with the current video block. In some embodiments for method 2000, the same neighboring video block located to the left and below the current video block. In some embodiments for method 2000, the first MPM list for the MIP mode and the second MPM list for the non-MIP intra mode is derived or constructed based on a same neighboring video block, where the same neighboring video block is located to left of the current video block at a bottom-most position or the same neighboring video block is located above the current video block at a right-most position. In some embodiments for method 2000, the first MPM list for the MIP mode and the second MPM list for the non-MIP intra mode is derived or constructed based on a same neighboring video block located above the current video block.
  • the same neighboring video block located to above is directly above the current video block and is aligned with the current video block. In some embodiments for method 2000, the same neighboring video block located to left and above the current video block. In some embodiments for method 2000, the first MPM list for the MIP mode and the second MPM list for the non-MIP intra mode is derived or constructed based on a same neighboring video block, where the same neighboring video block is located above the current video block at a left-most position or the same neighboring video block is located to left of the current video block at a top-most position.
  • the non-MIP intra mode is based on an intra prediction mode, a multiple reference line (MRL) intra prediction mode, or an intra sub-partition (ISP) tool.
  • the first MPM list for the MIP mode is further based on a height or a width of the current video block.
  • the first MPM list for the MIP mode is further based on a height or a width of a neighboring video block of the current video block. In some embodiments for method 2000, the first MPM list for the MIP mode is constructed based on a first set of parameters that is different from a second set of parameters used to construct the second MPM list for the non-MIP intra mode. In some embodiments for method 2000, the second MPM list for non-MIP intra mode includes S intra-prediction modes, and where K out of S intra-prediction modes are derived to be included in the first MPM list for MIP mode. In some embodiments for method 2000, K is 3 and S is 6.
  • the first K intra-prediction modes in the second MPM list for non-MIP intra mode is derived to be included in the first MPM list for MIP mode.
  • a first mode listed in the first MPM list for MIP mode is different from a first mode listed in the second MPM list for non-MIP intra mode.
  • the first mode listed in the first MPM list for MIP mode is a first mode, and where the first mode listed in the second MPM list for non-MIP intra mode is a planar mode.
  • the first mode in the first MPM list for MIP mode is converted from the planar mode in the second MPM list for non-MIP intra mode.
  • the first MPM list for MIP mode includes a first set of intra-prediction modes of neighboring video blocks of the current video block
  • the second MPM list for non-MIP intra mode includes a second set of intra-prediction modes of the neighboring video blocks of the current video block
  • the first set of intra-prediction modes are different from the second set of intra-prediction modes.
  • the first set of shifted intra-prediction modes includes an MIP mode (Y) shifted by K1 according to a first formula Y+K1
  • the second set of shifted intra-prediction modes includes a non-MIP intra mode (X) shifted by K0 according to a second formula X+K0
  • K1 is different from K0.
  • K1 depends on a width and a height of the current video block.
  • the method 2000 further includes performing a first determination that a neighboring video block of the current video block is coded with a non-MIP intra mode; and performing a second determination, in response to the first determination, that the neighboring video block is unavailable for the constructing of the first MPM list for the MIP mode.
  • the method 2000 further includes performing a first determination that a neighboring video block of the current video block is coded with a non-MIP intra mode; and performing, in response to the first determination, a second determination that the neighboring video block is coded with a pre-defined MIP intra-prediction mode, where the first MPM list for the MIP mode is constructed using the pre-defined MIP intra-prediction mode.
  • the pre-defined MIP intra-prediction mode depends on a width and/or a height of the current video block.
  • FIG. 21 shows an example flowchart of an example method 2100 for matrix-based intra prediction.
  • Operation 2100 includes generating, for a conversion between a current video block of a video and a coded representation of the current video block, a most probable mode (MPM) list based on a rule, where the rule is based on whether a neighboring video block of the current video block is coded with a matrix based intra prediction (MIP) mode in which a prediction block of the neighboring video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 2104 includes performing the conversion between the current video block and the coded representation of the current video block using the MPM list, where the conversion applies a non-MIP mode to the current video block, and where the non-MIP mode is different from the MIP mode.
  • the rule specifies that the neighboring video block coded with the MIP mode is treated as unavailable for generating the MPM list for the non-MIP coded current video block. In some embodiments for method 2100, the rule specifies that the neighboring video block coded with the MIP mode is determined to be coded with a pre-defined intra-prediction mode. In some embodiments for method 2100, the rule specifies that the pre-defined intra-prediction mode includes a planar mode.
  • FIG. 22 shows an example flowchart of an example method 2200 for matrix-based intra prediction.
  • Operation 2202 includes decoding a current video block of a video that is coded in a coded representation of the current video block using a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 2204 includes updating a line buffer associated with the decoding without storing in the line buffer information indicating whether the current video block is coded using the MIP mode.
  • MIP matrix based intra prediction
  • the method 2200 further includes accessing a second video block of the video, where the second video block is decoded before the decoding the current video block, where the second video block is located at a different Largest Coding Unit (LCU) or Coding Tree Unit (CTU) row or CTU region compared to that of the current video block, and where the current video block is decoded without determining whether the second video block is coded using the MIP mode.
  • LCU Largest Coding Unit
  • CTU Coding Tree Unit
  • the method 2200 further includes accessing a second video block by determining that the second video block is coded using a non-MIP intra mode without determining whether the second video block is coded using the MIP mode, where the second video located at a different Largest Coding Unit (LCU) or Coding Tree Unit (CTU) row or CTU region compared to that of the current video block; and decoding, based on the accessing the second video block, the current video block.
  • LCU Largest Coding Unit
  • CTU Coding Tree Unit
  • FIG. 23 shows an example flowchart of an example method 2300 for matrix-based intra prediction.
  • Operation 2302 includes performing a conversion between a current video block and a bitstream representation of the current video block, where the current video block is coded using a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation, where a flag is coded in the bitstream presentation using at most K contexts in an arithmetic coding or a decoding process, where the flag indicates whether the current video block is coded using the MIP mode, and where K is greater than or equal to zero.
  • K is 1.
  • K is 4.
  • FIG. 24 shows an example flowchart of an example method 2400 for matrix-based intra prediction.
  • Operation 2402 includes generating, for a conversion between a current video block of a video and a bitstream representation of the current video block, an intra prediction mode for the current video block coded with a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 2404 includes determining a rule for storing information indicative of the intra prediction mode based on whether the current video block is coded with the MIP mode.
  • MIP matrix based intra prediction
  • Operation 2406 includes performing the conversion according to the rule, where the rule defines that a syntax element for the intra prediction mode is stored in the bitstream representation for the current video block, and where the rule defines that a mode index for the MIP mode for the current video block is not stored in the bitstream representation.
  • the mode index for the MIP mode is associated with the intra prediction mode.
  • the rule defines that the bitstream representation excludes a flag that indicates that the current video block is coded with the MIP mode.
  • the rule defines that the bitstream representation excludes a storage of information indicative of the MIP mode associated with the current video block.
  • the method 2400 further includes performing, after the conversion, a second conversion between a second video block of the video and the bitstream representation of the second video block, where the second video block is a neighboring video block of the current video block, and where the second conversion is performed without determining whether the second video block is coded using the MIP mode.
  • FIG. 25 shows an example flowchart of an example method 2500 for matrix-based intra prediction.
  • Operation 2502 includes performing a first determination that a luma video block of a video is coded using a matrix based intra prediction (MIP) mode in which a prediction block of the luma video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 2504 includes performing, based on the first determination, a second determination about a chroma intra mode to be used for a chroma video block associated with the luma video block.
  • Operation 2506 includes performing, based on the second determination, a conversion between the chroma video block and a bitstream representation of the chroma video block.
  • the performing the second determination includes determining that the chroma intra mode is a Derived Mode (DM) without depending on a signaling.
  • the luma video block covers a predetermined corresponding chroma sample of the chroma video block.
  • the predetermined corresponding chroma sample is a top-left sample or a center sample of the chroma video block.
  • the chroma intra mode includes a Derived Mode (DM) .
  • the DM is used to derive a first intra prediction mode for the chroma video block from a second intra prediction mode of the luma video block.
  • the MIP mode associated with the luma video block is mapped to a pre-defined intra mode.
  • a plurality of Derived Modes are derived in response to the first determination that the luma video block is coded with the MIP mode.
  • the chroma intra mode includes a specified intra prediction mode.
  • the pre-defined intra mode or the specified intra mode is a Planar mode.
  • the chroma video block is coded using the MIP mode.
  • the chroma video block is coded using a first matrix or a first bias vector that are different from a second matrix or a second bias vector of a second chroma video block.
  • the chroma video block is a blue color component, where the first matrix or the first bias vector is predefined for the blue color component, where the second chroma video block is a red color component, where the second matrix or the second bias vector is predefined for the red color component.
  • the chroma video block is coded using the MIP mode with a subsampled matrix and/or a bias vector. In some embodiments for method 2500, a number of MIP modes for the luma video block and the chroma video block are different. In some embodiments for method 2500, the chroma video block is associated with a first number of MIP modes, the luma video block is associated with a second number of MIP modes, and the first number of MIP modes is less than the second number of MIP modes. In some embodiments for method 2500, the chroma video block and the luma video block have a same size.
  • FIG. 26 shows an example flowchart of an example method 2600 for matrix-based intra prediction.
  • Operation 2602 includes performing a conversion between a current video block of a video and a coded representation of the current video block, where the conversion is based on a determination (or based on determining) whether to code the current video block using a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • MIP matrix based intra prediction
  • a syntax element is included in the coded representation in response to the determination that the current video block is to be coded with the MIP mode, and the syntax element indicates the use the MIP mode for coding the current video block.
  • the coded representation includes a syntax element that indicates that the MIP mode is enabled or disabled for the current video block, and where the syntax element indicates that the MIP mode is allowed or disallowed for coding the current video block.
  • a syntax element is not included in the coded representation in response to the determination that the current video block is not to be coded with the MIP mode, and the syntax element indicates whether the MIP mode is used for the current video block.
  • a second syntax element indicating enabling of the MIP mode is further included in a sequence parameter set (SPS) , a picture parameter set (PPS) , a slice header, a tile group header, a tile header, a coding tree unit (CTU) row or a CTU region.
  • SPS sequence parameter set
  • PPS picture parameter set
  • CTU coding tree unit
  • the determination whether to use the MIP mode for the conversion is based on a height (H) and/or a width (W) of the current video block.
  • the current video block is determined not to be coded using the MIP mode in response to W ⁇ T1 and H ⁇ T2.
  • FIG. 27A shows an example flowchart of an example video encoding method 2700A for matrix-based intra prediction.
  • Operation 2702A includes determining, for encoding a current video block of a video into a bitstream representation of the current video block, according to a rule whether to use a matrix based intra prediction (MIP) mode and a coding mode that is different from the MIP mode for encoding the current video block, where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 2704A includes adding, based on the determining, an encoded representation of the current video block to the bitstream representation.
  • FIG. 27B shows an example flowchart of an example video decoding method 2700B for matrix-based intra prediction.
  • Operation 2702B includes determining that a current video block of a video is encoded in a bitstream representation using a matrix based intra prediction (MIP) mode and a coding mode that is different from the MIP mode, where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 2704B includes generating a decoded representation of the current video block by parsing and decoding the bitstream representation.
  • MIP matrix based intra prediction
  • the coding mode is a combined intra and inter prediction (CIIP) mode
  • the method further comprises generating an intra prediction signal for the current video block by performing a selection between the MIP mode and an intra prediction mode.
  • the performing the selection is based on a signaling in the bitstream representation of the current video block.
  • the performing the selection is based on a predetermined rule.
  • the predetermined rule selects the MIP mode in response to the current video block being coded using the CIIP mode.
  • the predetermined rule selects the intra prediction mode in response to the current video block being coded using the CIIP mode. In some embodiments for method 2700A and/or 2700B, the predetermined rule selects a Planar mode in response to the current video block being coded using the CIIP mode. In some embodiments for methods 2700A and/or 2700B, the performing the selection is based on information associated with neighboring video blocks of the current video block.
  • a first downsampling procedure for downsampling a neighboring sample of the current video block in the CCLM prediction mode uses at least some of a second downsampling procedure for the MIP prediction mode in which neighboring luma samples of the current video block are downsampled.
  • the first downsampling procedure for the MIP mode is based on a first set of parameters
  • the first downsampling procedure for the CCLM prediction mode is based on a second set of parameters different from the first set of parameters.
  • FIG. 28 shows an example flowchart of an example method 2800 for matrix-based intra prediction.
  • Operation 2802 includes making a determination about an applicability of a loop filter to a reconstructed block of a current video block of a video in a conversion between the video and a coded representation of the current video block, where the current video block is coded using a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 2804 includes processing the current video block according to the determination.
  • MIP matrix based intra prediction
  • the loop filter includes a deblocking filter. In some embodiments for method 2800, the loop filter includes a sample adaptive offset (SAO) . In some embodiments for method 2800, the loop filter includes an adaptive loop filter (ALF) .
  • SAO sample adaptive offset
  • ALF adaptive loop filter
  • FIG. 29B shows an example flowchart of an example video decoding method 2900B for matrix-based intra prediction.
  • Operation 2902B includes determining that a current video block of a video is encoded in a bitstream representation using a matrix based intra prediction (MIP) mode and using a type of neighboring samples of the current video block according to a rule, where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 2904B includes generating a decoded representation of the current video block by parsing and decoding the bitstream representation.
  • the rule defines that the type of neighboring samples are unfiltered neighboring samples. In some embodiments for methods 2900A and/or 2900B, the rule defines that the type of neighboring samples that include the unfiltered neighboring samples are used for an upsampling process, the rule defines that the type of neighboring samples that include the unfiltered neighboring samples are used for a downsampling process, and the rule defines that the type of neighboring samples that include the unfiltered neighboring samples are used for the matrix vector multiplication operation. In some embodiments for methods 2900A and/or 2900B, the rule defines that the type of neighboring samples are filtered neighboring samples.
  • the rule defines that the type of neighboring samples that include unfiltered neighboring samples are used for an upsampling technique, and the rule defines that the type of neighboring samples that include filtered neighboring samples are used for a downsampling technique.
  • the rule defines that the type of neighboring samples that include unfiltered neighboring samples are used for a downsampling technique, and the rule defines that the type of neighboring samples that include filtered neighboring samples are used for an upsampling technique. In some embodiments for methods 2900A and/or 2900B, the rule defines that the type of neighboring samples that include unfiltered above neighboring samples are used for an upsampling technique, and the rule defines that the type of neighboring samples that include filtered left neighboring samples are used for an upsampling technique.
  • the rule defines that the type of neighboring samples that include unfiltered left neighboring samples are used for an upsampling technique, and the rule defines that the type of neighboring samples that include filtered above neighboring samples are used for an upsampling technique.
  • the type of neighboring samples include unfiltered neighboring samples or filtered neighboring samples
  • the rule defines that whether the unfiltered neighboring samples or the filtered neighboring samples are used is based on the MIP mode of the current video block.
  • methods 2900A and/or 2900B further comprise converting the MIP mode to an intra prediction mode, where the type of neighboring samples include unfiltered neighboring samples or filtered neighboring samples, and where the rule defines that whether the unfiltered neighboring samples or the filtered neighboring samples are used is based on the intra prediction mode.
  • the type of neighboring samples include unfiltered neighboring samples or filtered neighboring samples, and the rule defines that whether the unfiltered neighboring samples or the filtered neighboring samples are used is based on a syntax element or signaling.
  • the filtered neighboring samples or the filtered left neighboring samples or the filtered above neighboring samples are generated using an intra prediction mode.
  • FIG. 30 shows an example flowchart of an example method 3000 for matrix-based intra prediction.
  • Operation 3002 includes performing a conversion between a current video block of a video and a bitstream representation of the current video block, where the conversion includes generating, by using a matrix based intra prediction (MIP) mode, a prediction block for the current video block by selecting and applying matrix multiplication using matrices of samples and/or by selecting and adding an offset using offset vectors for the current video block, where the samples are obtained from a row and column wise averaging of previously coded samples of the video, and where the selecting is based on reshaping information associated with applying a luma mapping with chroma scaling (LMCS) technique on a reference picture of the current video block.
  • MIP matrix based intra prediction
  • the reshaping information when a reshaping technique is enabled for the reference picture, the reshaping information is associated with the matrices and/or the offset vectors that are different from those associated with the reshaping information when the reshaping technique is disabled for the reference picture.
  • different matrices and/or the offset vectors are used for different reshaping parameters of the reshaping information.
  • the performing the conversion includes performing intra prediction on the current video block using the MIP mode in an original domain.
  • neighboring samples of the current video block are mapped to the original domain in response to applying the reshaping information, and where the neighboring samples are mapped to the original domain before being used in MIP mode.
  • FIG. 31 shows an example flowchart of an example method 3100 for matrix-based intra prediction.
  • Operation 3102 includes determining that a current video block is to be coded using a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 3104 includes performing, based on the determining, a conversion between the current video block and a bitstream representation of the current video block, where the performing the conversion is based on a rule of co-application of the MIP mode and another coding technique.
  • MIP matrix based intra prediction
  • the rule specifies that the MIP mode and the another coding technique are used mutually exclusively. In some embodiments for method 3100, the rule specifies that the another coding technique is high dynamic range (HDR) technique or a reshaping technique.
  • HDR high dynamic range
  • FIG. 32 shows an example flowchart of an example method 3200 for matrix-based intra prediction.
  • Operation 3202 includes performing a conversion between a current video block of a video and a bitstream representation of the current video block using a matrix based intra prediction (MIP) mode, where the performing the conversion using the MIP mode includes generating a prediction block by applying matrix multiplication using matrices of samples obtained from a row and column wise averaging of previously coded samples of the video, and where the matrices depend on a bit-depth of a sample.
  • MIP matrix based intra prediction
  • FIG. 33 shows an example flowchart of an example method 3300 for matrix-based intra prediction.
  • Operation 3302 includes generating, for a current video block of a video, an intermediate prediction signal using a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 3304 includes generating, based on the intermediate prediction signal, a final prediction signal.
  • Operation 3306 includes performing, based on the final prediction signal, a conversion between the current video block and a bitstream representation of the current video block.
  • the generating the final prediction signal is performed by applying a Position Dependent Intra Prediction Combination (PDPC) to the intermediate prediction signal.
  • the generating the final prediction signal is performed by generating the previously coded samples of the video with the MIP mode and by filtering the previously coded samples with neighboring samples of the current video block.
  • PDPC Position Dependent Intra Prediction Combination
  • FIG. 34 shows an example flowchart of an example method 3400 for matrix-based intra prediction.
  • Operation 3402 includes performing a conversion between a current video block of a video and a bitstream representation of the current video block using a matrix based intra prediction (MIP) mode, where the performing the conversion includes using an interpolation filter in an upsampling process for the MIP mode, where, in the MIP mode, a matrix multiplication is applied to a first set of samples obtained from a row and column wise averaging of previously coded samples of the video, and the interpolation filter is applied to a second set of samples obtained from the matrix multiplication, and where interpolation filter excludes a bilinear interpolation filter.
  • MIP matrix based intra prediction
  • the interpolation filter includes a 4-tap interpolation filter.
  • a motion compensation for chroma components of the current video block is performed using the 4-tap interpolation filter.
  • an angular intra-prediction of the current video block is performed using the 4-tap interpolation filter.
  • the interpolation filter includes an 8-tap interpolation filter, and a motion compensation for luma component of the current video block is performed using the 8-tap interpolation filter.
  • FIG. 35 shows an example flowchart of an example method 3500 for matrix-based intra prediction.
  • Operation 3502 includes performing a conversion between a current video block of a video and a bitstream representation of the current video block according to a rule, where the rule specifies a relationship between applicability of a matrix based intra prediction (MIP) mode or a transform mode during the conversion, where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation, and where the transform mode specifies use of a transform operation for the determining the prediction block for the current video block.
  • MIP matrix based intra prediction
  • the transform mode includes a Reduced Secondary Transform (RST) , a secondary transform, a rotation transform or a Non-Separable Secondary Transform (NSST) .
  • the rule indicates that the transform operation using the transform mode is not to be applied in response to the MIP mode being applied to the current video block.
  • the rule indicates whether to apply the transform operation using the transform mode based on a height (H) or a width (W) of the current video block.
  • the rule indicates that the transform operation using the transform mode is not applied to the current video block in response to W ⁇ T1 and H ⁇ T2.
  • the rule indicates that the transform operation using the transform mode is to be applied in response to the current video block being coded with MIP mode.
  • a selection of a transform matrix or kernel for the transform operation is based on the current video block being coded with the MIP mode.
  • the method 3500 further includes converting the MIP mode to an intra prediction mode; and selecting a transform matrix or kernel based on the converted intra prediction mode.
  • the method 3500 further includes converting the MIP mode to an intra prediction mode; and selecting a transform matrix or kernel based on a classification of the converted intra prediction mode.
  • the converted intra prediction mode includes a planar mode.
  • the bitstream representation includes an indication of the MIP mode for the transform matrix.
  • the rule indicates that the bitstream representation excludes an indication of the MIP mode for pre-defined transform matrices.
  • the rule indicates that the transform operation using a transform skip technique is applied to the current video block in response to the current video block being coded with the MIP mode.
  • the bitstream representation of the current video block excludes signaling of the transform skip technique when the current video block is coded with the MIP mode.
  • FIG. 36 shows an example flowchart of an example method 3600 for matrix-based intra prediction.
  • Operation 3602 includes performing a conversion between a current video block of a video and a bitstream representation of the current video block using a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation, where the performing the conversion includes deriving, according to a rule, boundary samples by applying a left bit shift operation or a right bit shift operation on a sum of at least one reference boundary sample, and where the rule determines whether to apply the left bit shift operation or the right bit shift operation.
  • MIP matrix based intra prediction
  • the rule defines that the right bit shift operation is applied in response to a number of shifted bits being greater than or equal to zero. In some embodiments for method 3600, the rule defines that the right bit shift operation is applied using a first technique in response to the number of shifted bits being greater than zero, and where the rule defines that the right bit shift operation is applied using a second technique in response to the number of shifted bits being equal to zero, where the first technique is different from the second technique.
  • the boundary samples upsBdryX [x] are calculated using following equation: where uDwn is equal to a function of the current video block and a boundary size, where refX [x] indicates a number of reference samples x, where >> indicates the right bit shift operation, and where ⁇ indicates the left bit shift operation.
  • the boundary size is predefined based on the current video block size.
  • FIG. 37 shows an example flowchart of an example method 3700 for matrix-based intra prediction.
  • FIG. 38 shows an example flowchart of an example method 3800 for matrix-based intra prediction.
  • Operation 3802 includes generating, for a conversion between a current video block of a video and a bitstream representation of the current video block, an intra prediction mode for the current video block coded with a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.
  • Operation 3804 includes determining a rule for storing information indicative of the intra prediction mode based on whether the current video block is coded with the MIP mode.
  • Operation 3806 includes performing the conversion according to the rule, where the rule defines that the bitstream representation excludes a storage of information indicative of the MIP mode associated with the current video block.
  • Implementations of the subject matter and the functional operations described in this patent document can be implemented in various systems, digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this specification and their structural equivalents, or in combinations of one or more of them. Implementations of the subject matter described in this specification can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a tangible and non-transitory computer readable medium for execution by, or to control the operation of, data processing apparatus.
  • the computer readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter effecting a machine-readable propagated signal, or a combination of one or more of them.
  • data processing unit or “data processing apparatus” encompasses all apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or computers.
  • the apparatus can include, in addition to hardware, code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them.
  • the processes and logic flows described in this specification can be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output.
  • the processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit) .
  • processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer.
  • a processor will receive instructions and data from a read only memory or a random access memory or both.
  • the essential elements of a computer are a processor for performing instructions and one or more memory devices for storing instructions and data.
  • a computer will also include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks.
  • mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks.
  • a computer need not have such devices.
  • Computer readable media suitable for storing computer program instructions and data include all forms of nonvolatile memory, media and memory devices, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices.
  • semiconductor memory devices e.g., EPROM, EEPROM, and flash memory devices.
  • the processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

L'invention concerne des dispositifs, des systèmes et des procédés de codage vidéo numérique, comprenant des procédés de prédiction intra basée sur une matrice permettant un codage vidéo. Dans un aspect représentatif, un procédé de traitement vidéo consiste à déterminer, en vue du codage d'un bloc vidéo courant d'une vidéo en une représentation de flux binaire du bloc vidéo courant, un type d'échantillons voisins du bloc vidéo courant à utiliser selon une règle, et à ajouter, en fonction de la détermination, une représentation codée du bloc vidéo courant à la représentation de flux binaire, le bloc vidéo courant étant codé à l'aide d'un mode de prédiction intra basée sur une matrice (MIP) dans lequel un bloc de prédiction du bloc vidéo courant est déterminé en effectuant, sur des échantillons préalablement codés de la vidéo, une opération de sous-échantillonnage de limite, suivie d'une opération de multiplication de vecteur de matrice, et sélectivement suivie d'une opération de suréchantillonnage.
PCT/CN2020/084462 2019-04-12 2020-04-13 Interaction entre une prédiction intra basée sur une matrice et d'autres outils de codage WO2020207492A1 (fr)

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CN202080028043.4A CN113678440B (zh) 2019-04-12 2020-04-13 基于矩阵的帧内预测与其它编码工具之间的交互
JP2021559285A JP7299341B2 (ja) 2019-04-12 2020-04-13 ビデオ処理方法、装置、記憶媒体、及び記憶方法
EP20788667.2A EP3935838A4 (fr) 2019-04-12 2020-04-13 Interaction entre une prédiction intra basée sur une matrice et d'autres outils de codage
KR1020217031712A KR20210145755A (ko) 2019-04-12 2020-04-13 행렬 기반 인트라 예측과 다른 코딩 툴들 사이의 상호작용
US17/343,041 US11457220B2 (en) 2019-04-12 2021-06-09 Interaction between matrix-based intra prediction and other coding tools

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PCT/CN2020/084499 WO2020207500A1 (fr) 2019-04-12 2020-04-13 Détermination de contexte permettant une prédiction intra basée sur une matrice
PCT/CN2020/084455 WO2020207491A1 (fr) 2019-04-12 2020-04-13 Calcul de prédiction intra basée sur une matrice
PCT/CN2020/084486 WO2020207497A1 (fr) 2019-04-12 2020-04-13 Applicabilité de prédiction intra basée sur une matrice
PCT/CN2020/084462 WO2020207492A1 (fr) 2019-04-12 2020-04-13 Interaction entre une prédiction intra basée sur une matrice et d'autres outils de codage
PCT/CN2020/084505 WO2020207502A1 (fr) 2019-04-12 2020-04-13 Construction de liste de modes les plus probables destinée à une prédiction intra fondée sur une matrice
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PCT/CN2020/084455 WO2020207491A1 (fr) 2019-04-12 2020-04-13 Calcul de prédiction intra basée sur une matrice
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